1 /*
2  * arch/sh/kernel/cpu/sh2a/clock-sh7206.c
3  *
4  * SH7206 support for the clock framework
5  *
6  *  Copyright (C) 2006  Yoshinori Sato
7  *
8  * Based on clock-sh4.c
9  *  Copyright (C) 2005  Paul Mundt
10  *
11  * This file is subject to the terms and conditions of the GNU General Public
12  * License.  See the file "COPYING" in the main directory of this archive
13  * for more details.
14  */
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <asm/clock.h>
18 #include <asm/freq.h>
19 #include <asm/io.h>
20 
21 static const int pll1rate[]={1,2,3,4,6,8};
22 static const int pfc_divisors[]={1,2,3,4,6,8,12};
23 #define ifc_divisors pfc_divisors
24 
25 #if (CONFIG_SH_CLK_MD == 2)
26 #define PLL2 (4)
27 #elif (CONFIG_SH_CLK_MD == 6)
28 #define PLL2 (2)
29 #elif (CONFIG_SH_CLK_MD == 7)
30 #define PLL2 (1)
31 #else
32 #error "Illigal Clock Mode!"
33 #endif
34 
35 static void master_clk_init(struct clk *clk)
36 {
37 	clk->rate *= PLL2 * pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0007];
38 }
39 
40 static struct clk_ops sh7206_master_clk_ops = {
41 	.init		= master_clk_init,
42 };
43 
44 static unsigned long module_clk_recalc(struct clk *clk)
45 {
46 	int idx = (ctrl_inw(FREQCR) & 0x0007);
47 	return clk->parent->rate / pfc_divisors[idx];
48 }
49 
50 static struct clk_ops sh7206_module_clk_ops = {
51 	.recalc		= module_clk_recalc,
52 };
53 
54 static unsigned long bus_clk_recalc(struct clk *clk)
55 {
56 	return clk->parent->rate / pll1rate[(ctrl_inw(FREQCR) >> 8) & 0x0007];
57 }
58 
59 static struct clk_ops sh7206_bus_clk_ops = {
60 	.recalc		= bus_clk_recalc,
61 };
62 
63 static unsigned long cpu_clk_recalc(struct clk *clk)
64 {
65 	int idx = (ctrl_inw(FREQCR) & 0x0007);
66 	return clk->parent->rate / ifc_divisors[idx];
67 }
68 
69 static struct clk_ops sh7206_cpu_clk_ops = {
70 	.recalc		= cpu_clk_recalc,
71 };
72 
73 static struct clk_ops *sh7206_clk_ops[] = {
74 	&sh7206_master_clk_ops,
75 	&sh7206_module_clk_ops,
76 	&sh7206_bus_clk_ops,
77 	&sh7206_cpu_clk_ops,
78 };
79 
80 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
81 {
82 	if (idx < ARRAY_SIZE(sh7206_clk_ops))
83 		*ops = sh7206_clk_ops[idx];
84 }
85 
86